‘The Biggest Loser”s long-time trainer Bob Harper is finally speaking out on Rachel Frederickson’s shocking 155-pound weight loss. In a new interview, Bob told Rachael Ray that he was stunned — and not necessarily in a good way!

When Rachel Frederickson weighed in at a meager 105 pounds during the Feb. 4 Biggest Loser Season 15 finale, she became the first contestant in the show’s history to end her season underweight. Bob Harper had previously kept mum about his visibly shocked reaction, but he candidly discussed Rachel’s health during a taping of The Rachael Ray Show on Feb. 6.

‘Biggest Loser’ Trainer Bob Harper: Rachel ‘Not In Good Health’

When Bob taped his Rachael Ray segment — which will air on Feb. 13 — he told the host that himself and his fellow trainers cannot take responsibility for what happens to the contestants’ bodies after they leave the Biggest Loser ranch.

‘Biggest Loser’ Revealed

“What people don’t understand is, when the contestants leave to go home…they’re in charge of themselves,” he said. “So I had not seen [Rachel] until that night, and so when she walked out, I was just kind of like, ‘whoa.’ And I’ve been on the show since the beginning.”

When Rachael pressed for more details, Bob admitted that the reaction we saw during the show’s live finale was genuine.

“I was stunned. That would be the word,” he admitted. “I mean, we’ve never had a contestant come in at 105 pounds.”

Bob is also off the hook because he wasn’t Rachel’s trainer even when she was on the ranch — that honor went to Dolvett Quince, who broke his silence on the issue on Feb. 6.

“Please try not to look at once slice of Rachel’s journey and come to broad conclusions,” he wrote. “Rachel’s heath is and has always been my main concern, and her journey to good health has not yet ended!!”

What do you think, HollywoodLifers? Are you surprised that Bob spoke so candidly about Rachel?